About Product:Tempered Glass Is Actually a Kind of Prestressed Glass. in Order to Improve the Strength of Glass, Chemical Or Physical Methods Are Usually Used to Form Compressive Stress on the Surface of Glass. When the Glass Bears External Force, It First Offsets the Surface Stress, therefore, the Bearing Capacity Is Improved, and the Resistance of the Glass Itself to Wind Pressure, Cold and Summer, Impact, Etc. Is Enhanced. Tempered Glass Protective Film Is the Highest Security Level Protection for Mobile Phone Screen.